<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			div {
				width: 200px;
				height: 100px;
				background-color: orange;
				transition: all 2s;
				
				/* 参与过渡的属性 */
				/* transition-property: width; */
				/* 过渡完成时间 */
				/* transition-duration: 2s; */
				/* 过渡类型 */
				/* transition-timing-function: linear; */
				/* 延迟时间 */
				/* transition-delay: 0s; */
			}

			div:hover {
				width: 500px;
				height: 300px;
				background-color: green;
			}
		</style>
	</head>
	<body>
		<div></div>
	</body>
</html>
